My battery capacity has fallen off of a cliff

[Android Central Question]

On Monday, my Galaxy Note 8 was functioning perfectly fine. Now three years old, its battery doesn't quite last all day any longer, but that was manageable. Tuesday morning was a whole different story. It dropped to 20% by Noon, and then after a recharge, down to 6% by 5:00p. So literally overnight, my phone's battery capacity has rendered the phone almost unusable.

I can think of no freshly installed app that could be responsible. I am willing to hard-reset the phone, but I don't really have any confirmation of that addressing this. So that is my first question: are there battery conditions like what I am describing that are addressed with a factory reset?

What else should I know as I troubleshoot this?

 

[mustang7757]

Download a app called Accu battery see the device health , it does sound like your battery might be issue. Also try safe mode .

I'll leave a Link to register so you can communicate here as a guest account you can only post questions but can't reply.
https://forums.androidcentral.com/showthread.php?t=409154

 

[Android Central Question]

Why is my battery draining so fast

(Trying again, now that I have logged in to my account)
After three years of normal operation and the gradual decline of battery capacity that is expected with age, yesterday, my Galaxy Note 8's battery capacity fell off of a cliff. Literally overnight, I am now losing about 1% every two minutes. There is no app activity that would account for this.

I am willing to factory reset the phone if the smart folks here think that is a reasonable course of action.

 

[mustang7757]

[Merged what seems to be duplicates]

 

[B. Diddy]

Welcome to Android Central! I would agree that the battery might be starting to deteriorate. Charge up to 100%, then let it drain to 20-30% with normal usage, without charging in between. Then show us:

1. The main Settings>Battery screen.
2. The fullscreen battery graph screen (which may show Awake time and Cell Signal Strength).
3. The Screen category (to see total Screen On time).
4. The Cell Standby category, if present (to see Time Without Signal).


http://forums.androidcentral.com/ge...ide-how-post-screenshots-android-central.html
You might have to install a 3rd party battery monitor, like GSam Battery Monitor, to get the Cell Signal Strength graph.